From 01c3460cdbe05501798c14fee3254d16289e759f Mon Sep 17 00:00:00 2001
From: Bernard Xiong <bernard.xiong@gmail.com>
Date: Wed, 28 Jan 2015 14:13:44 +0800
Subject: [PATCH] [DevFS] fix the device none-open issue

---
 components/dfs/filesystems/devfs/devfs.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/components/dfs/filesystems/devfs/devfs.c b/components/dfs/filesystems/devfs/devfs.c
index 969c5d3321..1f4569558f 100644
--- a/components/dfs/filesystems/devfs/devfs.c
+++ b/components/dfs/filesystems/devfs/devfs.c
@@ -131,6 +131,7 @@ int dfs_device_fs_close(struct dfs_fd *file)
 
 int dfs_device_fs_open(struct dfs_fd *file)
 {
+    rt_err_t result;
     rt_device_t device;
 
     if (file->flags & DFS_O_CREAT)
@@ -186,9 +187,16 @@ int dfs_device_fs_open(struct dfs_fd *file)
     if (device == RT_NULL)
         return -DFS_STATUS_ENODEV;
 
-    file->data = device;
-    
-    return DFS_STATUS_OK;
+    /* to open device */
+    result = rt_device_open(device, RT_DEVICE_OFLAG_RDWR);
+    if (result == RT_EOK || result == -RT_ENOSYS)
+    {
+        file->data = device;
+        return DFS_STATUS_OK;
+    }
+
+    /* open device failed. */
+    return -DFS_STATUS_EIO;
 }
 
 int dfs_device_fs_stat(struct dfs_filesystem *fs, const char *path, struct stat *st)
-- 
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